On Wed, 01 Jul 2015 13:01:34 -0400, Martin Michlmayr wrote: > netrek-client-cow fails to build with GCC 5. Even though the > configure script finds gmp.h, HAVE_GMP2_H is not set, therefore mp.h > is used instead of gmp.h.
Nice finding; now I tried to find out why this is happening, and I don't really have an answer, but maybe this helps someone else: IIUIC, what configure does is create a temporary file conftests.h with something like: #v+ /* confdefs.h. */ /* end confdefs.h. */ #include <gmp.h> gmp=__GNU_MP__; #v- and then runs `gcc -E confdefs.h | egrep "gmp=$something" The end of the diff between the output with gcc 4.9 and gcc 5 is: #v+ -extern __inline__ +extern __inline__ __attribute__ ((__gnu_inline__)) mp_limb_t __gmpn_neg (mp_ptr __gmp_rp, mp_srcptr __gmp_up, mp_size_t __gmp_n) @@ -1457,4 +1464,10 @@ }; # 5 "conftests.h" 2 -gmp=5; + +# 6 "conftests.h" +gmp= +# 6 "conftests.h" 3 4 + 5 +# 6 "conftests.h" + ; #v- So 4.9 outputs 'gmp=5;' and egrep is happy, and gcc5 has an interesting output where "gmp=" "5" ";" is split over 3 lines with some comments inbetween. Cheers, gregor -- .''`. Homepage: http://info.comodo.priv.at/ - OpenPGP key 0xBB3A68018649AA06 : :' : Debian GNU/Linux user, admin, and developer - https://www.debian.org/ `. `' Member of VIBE!AT & SPI, fellow of the Free Software Foundation Europe `- NP: Alanis Morisette: A Man
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